Unable to change keyboard layout Windows 7 Ultimate x32

Hi you all.
I'm having a problem here that's driving me crazy..
The option "Add keyboard layout" suddenly is unavailable.. I'm from Argentina, (that's my excuse for bad grammar) and my keyboard uses the locale es-es.

My SO, as the thread title says, is Windows Ultimate x32.

I recently installed the english language pack from windows update, hoping that some keyboards layouts would show up, but nothing happened..

I also tried this. I downloaded the lp.cab Spanish package and installed it from the command line as administrator. Nothing changed..

The following are two images from the Region/Language section in control panel.
In the first one, in Input Language it says "Unable to read configuration" (Circled in red)
The second one shows that when I click in 'Add Input Language' nothing shows up..

I'm hoping someone could help me on this one.,
I need to do some reports for college, and I can't use the spanish special characters..

Thanks in advance..

PS: System Restore is not enabled.

Matias.

Jacee said:

Scroll down to "Vista" and see if this works for you:

In Vista, you have to click on Regional and Language Options from the Control Panel. Then you need to click on Keyboards and Languages and then Change Keyboards.

How to Change the Keyboard Language in Windows

That's the problem,. when I do that, the list of available input languages to add, is absolutely empty..

The second picture I uploaded in the first post shows that window..